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LynnLee Schmidt, right, Curator of Birds and Mammals at the Denver Aquarium gets Olive, a North American River otter, to swim with her hand in her enclosure at the Denver Aquarium on July 26, 2017 in Denver. Olive, initially named Oliver as Aquarium workers believed she was male, was rescued after she approached a person at a gas station in Florida. Schmidt said it’s likely that she was pulled from her den or a person tried to keep her as a pet without realizing the demands of a North American river otter. (Helen H. Richardson/The Denver Post via AP)(Photo: Helen H. Richardson, AP)

Or, an otter who thinks humans are other otters. Employees at the Downtown Aquarium aren’t quite sure which way Olive thought. Regardless, it took a lot of patience to teach the frisky little mammal how to get along in the animal world.